问题: Actually,did you know that it's been found
Actually,did you know that it's been found in laboratory testing that some types of oil are really bad for us?
请问testing test的区别?这里可换用test吗?
解答:
testing 是动名词作名词用，如果换成test(名词)是可以的，不过应该用复数tests，因为test是可数名词。
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